ENVIRONMENTAL RESEARCH
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2022
·
IF 8.431
Xinyu Li,Hui Zhang,Xuedong Du,Shuaijie Wang,Qingrui Zhang,Houfen Li,Fei Ye
Constructing heterostructures has been a simple yet effective strategy for improving the photocatalytic performance of individual semiconductor photocatalysts. However, the poor quality of the contacted interface coupled with the narrow and overlapping light absorption scope between heterocomponents limits potential improvement. Herein, a 2D/2D rGO-Bi 2 WO 6 heterostructure with face-to-face compact contact interface and UV to NIR light absorption ability was synthesized to overcome the aforementioned limitations. The as-prepared 2 wt%-rGO-Bi 2 WO 6 with a high contact interface quality exhibits the highest kinetic rate of (5.53 ± 0.75) × 10 −2 L mg −1 min −1 toward tetracycline (TC) degradation, which is 2.4 times higher than that of pristine Bi 2 WO 6 and 2.1 times higher than that of the 2 wt%-rGO-Bi 2 WO 6 composite with a poor interface quality. Moreover, approximately 30% of TC can be mineralized with a 2 wt%-rGO-Bi 2 WO 6 presented system after 120 min. The subsequent Escherichia coli culture and liquid chromatography–mass spectrometry were employed to detect the biotoxicity variation of degradation intermediates and the possible transformation pathways of TC, respectively. Finally, the reactive species trapping results indicate that photogenerated holes and superoxide radical anions play dominant roles during the TC degradation process. This work provides a facile and effective method to fabricate an efficient heterojunction photocatalyst for pollutant degradation .
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2021
·
IF 6.158
Longjie Liu,Qingping Wang,Jiajiang Lin,Gary Owens,Zuliang Chen
Recently, estrogen has attracted widespread concern because it is increasing being detected in wastewater treatment plants. While techniques for estrogen removal have been reported, these have mostly focused on exploring the effect on removal using simple single-factor experiments, rather than applying more complex multifactor mathematical models to wastewater treatment. In this study, reduced graphene oxide-based iron nanoparticles (rGO@Fe NPs) were used for 17α-estradiol (αE 2 ) removal based on adsorption and Fenton oxidation . A response surface methodology , based on a Box-Behnken design, was used to determine the relationships between critical operation factors (pH, temperature, αE 2 concentration, rGO@Fe NPs dose and H 2 O 2 concentration) and removal efficiency to establish the optimal conditions for 1 mg L −1 αE 2 removal. Under the determined optimal reaction condition of pH 6.0, temperature 40 °C, 0.08 g L −1 rGO@Fe NPs dose and 6 mM H 2 O 2 , a maximum removal efficiency of 99.9% was obtained. Subsequently, the presence of co-existing anions (Cl − , SO 4 2− and NO 3 − ) significantly decreased the removal efficiency of αE 2 . However, αE 2 removal from domestic wastewater could be increased by 38.0% when applying RSM results. Moreover, αE 2 removal by rGO@Fe NPs remained stable over five reuse cycles indicating that rGO@Fe NPs would be an efficient and practical advanced materials for αE 2 removal.
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Journal of Energy Storage
·
2023
·
IF 9.4
T. Nandagopal,G. Balaji,S. Vadivel
The efficiency of a supercapacitor depends heavily on the materials used to create its electrodes. Physicochemical properties have piqued interest in using transition metal molybdates as electrode materials in supercapacitors . Monodisperse CoMoO 4 nanorods with a modest dimension (about 40–60 nm in width and 1.5–2 μm in length) were created on reduced graphene oxide (rGO) nanosheets were synthesized via a facile hydrothermal method . Hybrid CoMoO 4 @rGO electrodes have shown exceptional electrochemical properties, especially when compared to pure CoMoO 4 in an alkaline electrolyte . In particular, the maximum specific capacitance of CoMoO 4 @rGO is 1425 Fg −1 at a current density of 1Ag −1 , while the greatest specific capacitance of CoMoO 4 is 751 Fg −1 at the same current density. Both the pure and hybrid electrodes show excellent rate capability and long-term cyclic stability, even at high current densities of 20 Ag −1 . Also, at a current density of 20 Ag −1 , the constructed asymmetric supercapacitor generated a maximum power density of 4.5 kWkg −1 , and at a current density of 1 Ag −1 , it generated a high energy density of 51.2 Whkg −1 . Based on their promising electrochemical performance, the hierarchical CoMoO 4 @rGO nanocomposites were discovered to provide for a promising electrode material in the creation of highly effective supercapacitors for power storage.
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Russian Journal of Physical Chemistry A
·
2023
·Vol. 97
·期 4
·714-721
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IF 0.7
Han Jingliang,Chen Lian,Xu Zhengkai,Zhu Chengfei
Abstract Carbon steel was the most widely used grounding metal material. Polyaniline(PANI)/reduced graphene oxide (rGO) composite coating was prepared on carbon steel to optimize its performance by cyclic voltammetry for the first time in mixed solution of oxalic acid, aniline and rGO in this article. The structure and morphology of polyaniline were characterized by FTIR, XRD, and SEM. The effects of rGO doping on the conductivity and corrosion resistance of polyaniline were studied by polarization curve method and four probe method. The results showed that the PANI/rGO coating was successfully prepared on the surface of carbon steel. The PANI was continuously and densely covered on the surface of rGO as villous to reduce the porosity of the coating and improve the conductivity and corrosion resistance of the coating. The conductivity of the PANI coating increased from 3.33 to 23.05 S/cm after doping 10% rGO. The self-corrosion current density of PANI/rGO composite coated carbon steel in the soil decreased from 1.21 × 10 –3 to 5.19 × 10 –4 A/cm 2 and the corrosion inhibition efficiency was 57.1%.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Shang Wu,Xin Xu,Xin Sun,Sheng Zhou,Chaoyang Liu,Penghui Zhang,Shuaishuai Fu,Hong Zhang,Shaofeng Pang,Xia Wang,Quanlu Yang
Metal organic framework (MOF) as an electrode material is still a great challenge due to inherent instability and poor electrical conductivity . Herein, we design a material rGO/NiCo 2 S 4 , which by using GO and metal organic framework (ZIF-67) as the template and precursor. Additionally, the presence of GO and ZIF-67 can increase specific surface area and provide active sites for redox reactions and shortens ion transport pathways. The synthesized of rGO-10/NiCo 2 S 4 has excellent electrochemical properties as electrode material, which has a high specific capacity of 171 mAh g −1 and 121.9 mAh g −1 (1 A g −1 and 10 A g −1 ). The as-obtained rGO-10/NiCo 2 S 4 //AC asymmetric supercapacitor (ASC) of power density is 870 W kg −1 when the specific energy 41 Wh kg −1 , and with 88.2 % capacitance retention after 5000 cycles at 5 A g −1 . Therefore, the rGO-10/NiCo 2 S 4 derived from ZIF-67 as electrode materials for high-performance asymmetric supercapacitors has a good prospect.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xinyue Zhao,Mingwu Luo,Kunyao Peng,Zhibo Zhang,Bin Cheng,Bingbing Wang,Changbao Zhu,Xingbin Yan,Kaiyuan Shi
The dramatic growth of the sodium-ion battery market evokes a high demand for high-performance cathodes. In this work, a nanosized amorphous FePO4@rGO composite is developed using coprecipitation combined with low-temperature hydrothermal synthesis, which registered a surface area of 179.43 m2 g–1. The composites maintain three-dimensional mesoporous morphology with a pore size in the range of 3–4 nm. Uniform distribution of amorphous FePO4 allows a reversible capacity of 175.4 mA h g–1 at 50 mA g–1 while maintaining a stable cycle life of 500 cycles at 200 mA g–1. The amorphous FePO4@rGO, obtained by energy-efficient synthesis, significantly improved the rate performance compared to the crystalline material prepared at high temperatures. Cyclic voltammetry tests reveal that the fast reaction kinetics can be attributed to the pseudocapacitive behavior of the electrode. In addition, we demonstrated the promise of FePO4@rGO cathodes for low-temperature sodium-ion batteries.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
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IF 10.9
Junru Yao,Jintang Zhou,Lu Lu,Feng Yang,Zhengjun Yao,Bo Ouyang,Erjun Kan,Yuxin Zuo,Renchao Che,Fan Wu
Magnetic metal absorbers exhibit remarkable microwave absorption capacity. However, their practical application is severely limited due to their susceptibility to corrosion, particularly in marine environments. To address this challenge, we propose a novel approach involving the modification and control of FeCo/rGO microwave absorbers using rare earth lanthanum (La). This strategy aims to achieve both high-performance microwave absorption and enhanced resistance to marine corrosion. In this study, we employ a La 2 O 3 modifying control strategy to refine the FeCo magnetic particles and coat them with CoFe 2 O 4 on the surface, leveraging the pinning effect of in situ generated La 2 O 3 . This process enhances the interface polarization of the absorbers, thereby improving their electromagnetic performance and marine corrosion resistance . Consequently, the La 2 O 3 modified FeCo@rGO composites exhibit broadband absorption, covering a wide frequency range of 6.11 GHz at 1.55 mm. Notably, the electromagnetic properties of the La 2 O 3 modified FeCo@rGO absorbers remain stable even after prolonged exposure to a 3.5 wt% NaCl solution, simulating marine conditions, for at least 15 days. Furthermore, we perform first-principle calculations on FeCo and FeCo O to validate the corrosion resistance of the La 2 O 3 modified FeCo@rGO composites at the atomic level. This comprehensive investigation explores the control of rare earth lanthanum modification on the size of magnetic metal particles, enabling efficient electromagnetic wave absorption and marine corrosion resistance. The results of this study provide a novel and facile strategy for the control of microwave absorbers, offering promising prospects for future research and development in this field.
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Small
·
2023
·
IF 13.3
Zhuanxia Li,Lianghao Yu,Xin Tao,Yun Li,Linlin Zhang,Xuedong He,Yan Chen,Sha Xiong,Wei Hu,Jun Li,Jichang Wang,Huile Jin,Shun Wang
Sodium-ion batteries are a promising substitute for lithium batteries due to the abundant resources and low cost of sodium. Herein, honeycomb-shaped MoSe 2 /reduced graphene oxide (rGO) composite materials are synthesized from graphene oxide (GO) and MoSe 2 through a one-step solvothermal process. Experiments show that the 3D honeycomb structure provides excellent electrolyte penetration while alleviating the volume change during electrochemical cycling. An anode prepared with MoSe 2 /rGO composites exhibits significantly improved sodium-ion storage properties, where a large reversible capacity of 215 mAh g −1 is obtained after 2700 cycles at the current density of 30.0 A g −1 or after 5900 cycles at 8.0 A g −1 . When such an anode is paired with Na 3 V 2 (PO 4 ) 3 to form a full cell, a reversible specific capacity of 107.5 mAh g −1 can be retained after 1000 cycles at the current of 1.0 A g −1 . Transmission electron microscopy, X-ray photoelectron spectroscopy and in situ X-ray diffraction (XRD) characterization reveal the reversible storage reaction of Na ions in the MoSe 2 /rGO composites. The significantly enhanced sodium storage capacity is attributed to the unique honeycomb microstructure and the use of ether-based electrolytes. This study illustrates that combining rGO with ether-based electrolytes has tremendous potential in constructing high-performance sodium-ion batteries.
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MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Luyan Shen,He Chen,Chunhong Qi,Qiang Fu,Zhiyuan Xiong,Youyi Sun,Yaqing Liu
A facile process was developed to fabricate rGO/fluoroethylene vinyl ether (FEVE) nanocomposite coating for anti-corrosion application. Dry rGO modified with PS sphere were prepared with good re-dispersibility and directly added into FEVE organic paint, forming a rGO/FEVE nanocomposite coating. Furthermore, the effect of modified rGO on structure and properties of composite coating was investigated in detail. It was found that the composite coating (1.5 wt%) displayed best mechanical properties (e.g. adhesion strength of 14 MPa) and anti-corrosive performance (e.g. corrosive current density of 7.6 × 10 −12 A/cm 2 ) comparing with other composite coating based on rGO. This work thus provides a facile and environmentally friendly method to prepare novel nanocomposite coatings with enhanced performance for various practical applications.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 6
·1825-1834
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IF 2.647
Zhang Kai,Jiang PingPing,Nie Zhixin,Gu Qian,Zhang Pingbo
The development of transition metal-based catalysts for hydrogen evolution reaction with high active and stable performance is becoming an important means to reduce the energy consumption and cost of hydrogen products. In this paper, a two-step adding hydrothermal approach is conducted to manufacture 3D flower-like heteronanostructures composed of MoSe 2 -rGO-CNTs for the efficient electrocatalysis for hydrogen evolution reaction (HER) by acid medium hydrolysis. The physical structures and chemical compositions of the heteronanostructures were characterized with several techniques such as scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The heterostructures of the flower-like MoSe 2 -rGO-CNTs are formulated by in situ combination of the monolayer rGO-CNTs and MoSe 2 crystals, where the excellent quality transverse heterostructures can boost the electrons transferring from the monolayer rGO-CNTs interfaces to the MoSe 2 crystals, accomplishing the electronic deployment of MoSe 2 -rGO-CNTs heterostructures for prominent electrocatalytic performance. After optimization, the as-synthesized MoSe 2 -rGO-CNTs heterostructures catalyst exhibited an excellent electrocatalytic activity in 0.5 M H 2 SO 4 solution with an overpotential of 206 mV at the current density of 10 mA·cm −2 and a Tafel slope of 46.74 mV·dec −1 for HER reaction. The optimal MoSe 2 -rGO-CNTs heteronanostructures display an excellent HER electrocatalytic activity and superior long-term durability in an acidic medium. Graphical Abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 21
·18590-18604
·
IF 2.22
Zong Hanwen,Yang Haibo,Dong Jingjing,Ma Liang,Lin Ying,Qiu Yun,Wen Bo
Nowadays, designing and fabricating electromagnetic (EM) wave absorbers with lightweight and strong reflection loss (RL) is still urgent. Herein, rGO/CoFe 2 O 4 composite combined with magnetic CoFe 2 O 4 nanorods and reduced graphene oxide (rGO) was fabricated via molten salt method in combination with a simple etching route. The EM absorption ability of rGO/CoFe 2 O 4 nanorods composite can be regulated by changing the rGO addition amount. Particularly, the absorber for rGO/CoFe 2 O 4 nanorods composite with the rGO addition amount of 70 mg (S-70) displays favorable EM wave absorption properties. The optimal RL value is − 56.3 dB at the frequency of 16.9 GHz, when the corresponding thickness is 1.4 mm. The effective absorption bandwidth (EAB, RL < − 10 dB) is 4.3 GHz, when the thickness is 1.6 mm. Consequently, the rGO/CoFe 2 O 4 nanorods composite is a potential candidate for microwave absorbing materials.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 44
·49375
·
IF 2.52
Liai Yang,Ting Zhang,Wei Sun
To construct an actuator with biocompatibility and potential use in biomedicine field, a light-driven actuator composed of reduced graphene oxide (rGO)/poly (N-isopropyl acrylamide) (PNIPAM) and poly (ethylene glycol) diacrylate (PEGDA) hydrogel is constructed. First, rGO/PNIPAM hydrogel is prepared by free radical polymerization and l -ascorbic acid reduction, of which the surface temperature increases quickly under near-infrared (NIR) laser indicating the efficient photothermal conversion of rGO. The results of cytotoxicity tests demonstrate that rGO/PNIPAM is biocompatible and has no obvious toxicity to myoblast line C2C12 cells. Second, bilayer hydrogel composed of rGO/PNIPAM and PEGDA is prepared using a similar method layer-by-layer. The bilayer strip bends towards rGO/PNIPAM under NIR laser. The bending is improved after reduction. The laser power density has a strong impact on the bending rate and degree. The reversible bending deformation indicates the structural stability. All the above results approve that the bilayer actuator has great potential to be applied in biomedicine fields such as organ-on-chip, drug-carrier, or surgical aid.
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